Composite reinforced boron carbide ballistic panel and method of making

Abstract

The application discloses a composite reinforced boron carbide bulletproof plate and a preparation method thereof, and relates to the technical field of protective materials. The surface of the boron carbide bulletproof plate is covered with a layer of reinforcing material, the reinforcing material comprises a layer of metal mesh and a layer of glass steel composite plate, the metal mesh is a porous mesh structure, and the glass steel composite plate is a composite material composed of glass fiber cloth and a resin base material; a boron carbide ceramic base is prepared; a metal mesh is prepared; a glass steel composite plate is prepared; the metal mesh and the glass steel composite plate are respectively bonded on the surface of the boron carbide ceramic base to form a composite reinforcing structure; and the composite reinforced boron carbide bulletproof plate is subjected to drying treatment to fix the combination between the layers of materials. The composite reinforced boron carbide bulletproof plate prepared by the application has good bending strength and fracture toughness, and has the advantages of high strength and high rigidity, and can be widely applied in the field of bulletproof plates.

Description

Technical Field

[0001] This invention relates to the field of protective materials technology, specifically to a composite reinforced boron carbide bulletproof plate and its preparation method. Background Technology

[0002] Bulletproof plates are a common protective material, primarily used in military, police, and civilian applications. Currently, boron carbide is widely used in bulletproof plates due to its excellent properties such as high hardness, high melting point, high wear resistance, and high impact resistance. However, boron carbide itself is relatively brittle and prone to cracking and fracture, limiting its protective performance. Therefore, improving the impact resistance of boron carbide bulletproof plates has become a research hotspot in this field. Summary of the Invention

[0003] The purpose of this invention is to provide a composite reinforced boron carbide bulletproof plate and its preparation method, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A composite reinforced boron carbide bulletproof plate has a surface covered with a reinforcing material, the reinforcing material comprising a metal mesh and a fiberglass composite plate, the metal mesh being a porous mesh structure, and the fiberglass composite plate being a composite material made of fiberglass cloth and a resin substrate.

[0006] Preferably, the metal mesh is made of stainless steel.

[0007] Preferably, the thickness of the boron carbide ceramic matrix is ​​5-20 mm.

[0008] A method for preparing a composite reinforced boron carbide bulletproof plate includes the following steps:

[0009] (1) Prepare the boron carbide ceramic matrix;

[0010] (2) Preparation of metal mesh;

[0011] (3) Preparation of fiberglass composite panels;

[0012] (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure;

[0013] (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of materials.

[0014] Preferably, the method for preparing the metal mesh includes the following steps:

[0015] (1) Prepare stainless steel wire;

[0016] (2) Weave the stainless steel wire into a mesh structure;

[0017] (3) The mesh structure is oxidized to form a porous metal mesh.

[0018] Preferably, the preparation method of the fiberglass composite panel includes the following steps:

[0019] (1) Prepare fiberglass cloth and resin substrate;

[0020] (2) Coating the surface of the fiberglass cloth with a resin substrate;

[0021] (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

[0022] Preferably, the adhesive is a modified epoxy resin adhesive, and the preparation process of the modified epoxy resin adhesive is as follows:

[0023] Pre-dried magnesium lignin sulfonate and N,N-dimethylformamide were placed in a reaction vessel at a mass ratio of 1:10-1:20. The mixture was then stirred at 80-100℃ and 600-800 r / min for 2-3 hours. The temperature was then lowered to 50-60℃, and 0.1-0.2 times the mass of the pre-dried magnesium lignin sulfonate was added to the reaction vessel with triethylamine. Then, 0.1-0.2 times the volume of the N,N-dimethylformamide mixture was slowly added dropwise to the reaction vessel over 30 minutes using a peristaltic pump, and the reaction continued for another 2-3 hours. After the reaction, the triethylamine and N,N-dimethylformamide were removed by vacuum distillation to obtain modified lignin. The temperature was then raised to 80-100℃, and N,N-dimethylformamide was added to the reaction vessel... Add 0.2-0.3 times the volume of epichlorohydrin to the reaction vessel, then slowly add 0.1-0.2 times the volume of N,N-dimethylformamide to a 30% NaOH solution over 30 minutes and continue the reaction for 2-3 hours. After the reaction is complete, add 1-2 times the volume of N,N-dimethylformamide to the reaction vessel to terminate the reaction. Remove unreacted epichlorohydrin by vacuum distillation, and remove N,N-dimethylformamide, NaOH, and NaCl generated during the reaction by repeated centrifugation and washing. The resulting oily precipitate is the modified epoxy resin. Then, place the modified epoxy resin and E-51 type epoxy resin in a mixing vessel at a mass ratio of 3:7, and then cure it using T-31 type curing agent to obtain the modified epoxy resin adhesive.

[0024] Preferably, the preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:10-1:20 and stirred for 20-30 minutes at a speed of 600-800 r / min to obtain the mixture.

[0025] Preferably, before bonding the metal mesh and fiberglass composite plate to the surface of the boron carbide ceramic substrate, an adhesive layer is first applied to the surface of the boron carbide ceramic substrate, and then another adhesive layer is applied when bonding each layer of material to its surface.

[0026] Preferably, the drying temperature is 100-150℃ and the time is 3-5 hours.

[0027] In summary, due to the adoption of the above-mentioned technologies, the beneficial effects of this invention are:

[0028] This invention improves the compatibility of lignin sulfonate with organic reagents during the preparation of lignin adhesives by adding modified epoxy resin adhesives and by incorporating hydrophobic long chains to hydrophobically modify lignin sulfonate. The prepared lignin-based adhesive has good compatibility with epoxy resin adhesive components, and the modified lignin adhesive has better tensile elasticity and improved shear tensile strength of lignin sulfonate adhesives, thereby further increasing the bending strength and fracture toughness of the product.

[0029] High strength and high rigidity: The combination of boron carbide ceramics and polymer-based composite materials gives this bulletproof plate high strength and high rigidity, which can effectively resist the impact and penetration of high-speed ballistics.

[0030] High wear resistance: The surface of the composite reinforced boron carbide bulletproof plate is covered with hard boron carbide ceramic, which can effectively resist friction and wear and extend the product life.

[0031] Customizable: The types and proportions of boron carbide ceramic and polymer-based composite materials in composite reinforced boron carbide bulletproof plates can be adjusted and customized according to the needs of different users to meet the application requirements of different fields.

[0032] In summary, this product has excellent ballistic protection and wear resistance, which can effectively protect the safety of personnel and materials, and has broad application prospects and market potential. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0034] Example 1

[0035] A composite reinforced boron carbide bulletproof plate has a surface covered with a reinforcing material, the reinforcing material comprising a metal mesh and a fiberglass composite plate, the metal mesh being a porous mesh structure, and the fiberglass composite plate being a composite material made of fiberglass cloth and a resin substrate.

[0036] The metal mesh is made of stainless steel.

[0037] The thickness of the boron carbide ceramic matrix is ​​10 mm.

[0038] A method for preparing a composite reinforced boron carbide bulletproof plate includes the following steps:

[0039] (1) Prepare the boron carbide ceramic matrix;

[0040] (2) Preparation of metal mesh;

[0041] (3) Preparation of fiberglass composite panels;

[0042] (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure;

[0043] (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of materials.

[0044] The method for preparing a metal mesh includes the following steps:

[0045] (1) Prepare stainless steel wire;

[0046] (2) Weave the stainless steel wire into a mesh structure;

[0047] (3) The mesh structure is oxidized to form a porous metal mesh.

[0048] The preparation method of fiberglass composite panels includes the following steps:

[0049] (1) Prepare fiberglass cloth and resin substrate;

[0050] (2) Coating the surface of the fiberglass cloth with a resin substrate;

[0051] (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

[0052] The adhesive is a modified epoxy resin adhesive, and the preparation process of the modified epoxy resin adhesive is as follows:

[0053] Pre-dried magnesium lignin sulfonate and N,N-dimethylformamide were placed in a reactor at a mass ratio of 1:20. The mixture was then stirred at 100℃ and 800 r / min for 3 hours. The temperature was then lowered to 60℃, and 0.2 times the mass of the pre-dried magnesium lignin sulfonate was added to the reactor. Then, 0.2 times the volume of the N,N-dimethylformamide mixture was slowly added dropwise to the reactor over 30 minutes using a peristaltic pump, and the reaction continued for another 3 hours. After the reaction, the triethylamine and N,N-dimethylformamide were removed by vacuum distillation to obtain modified lignin. The temperature was then raised to 100℃, and 0.2 times the volume of N,N-dimethylformamide was added to the reactor. Epichlorohydrin was reacted with 0.2 times the volume of N,N-dimethylformamide in a 30% NaOH solution, which was slowly added dropwise over 30 minutes. The reaction was continued for 3 hours. After the reaction was completed, ice water with a volume equal to that of N,N-dimethylformamide was added to the reactor to terminate the reaction. Unreacted epichlorohydrin was removed by vacuum distillation, and N,N-dimethylformamide, NaOH, and NaCl generated during the reaction were removed by repeated centrifugation and washing. The resulting oily precipitate was the modified epoxy resin. The modified epoxy resin and E-51 type epoxy resin were then placed in a mixing tank at a mass ratio of 3:7. The mixture was then cured using T-31 type curing agent to obtain the modified epoxy resin adhesive.

[0054] The preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:20 and stirred for 20 minutes at a speed of 800 r / min to obtain the mixture.

[0055] Before bonding the metal mesh and fiberglass composite panel to the surface of the boron carbide ceramic substrate, apply a layer of adhesive to the surface of the boron carbide ceramic substrate. Then, when bonding each layer of material to its surface, apply another layer of adhesive.

[0056] Preferably, the drying process is carried out at a temperature of 150°C for 5 hours.

[0057] Example 2

[0058] A composite reinforced boron carbide bulletproof plate has a surface covered with a reinforcing material, the reinforcing material comprising a metal mesh and a fiberglass composite plate, the metal mesh being a porous mesh structure, and the fiberglass composite plate being a composite material made of fiberglass cloth and a resin substrate.

[0059] The metal mesh is made of stainless steel.

[0060] The thickness of the boron carbide ceramic matrix is ​​15 mm.

[0061] A method for preparing a composite reinforced boron carbide bulletproof plate includes the following steps:

[0062] (1) Prepare the boron carbide ceramic matrix;

[0063] (2) Preparation of metal mesh;

[0064] (3) Preparation of fiberglass composite panels;

[0065] (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure;

[0066] (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of materials.

[0067] The method for preparing a metal mesh includes the following steps:

[0068] (1) Prepare stainless steel wire;

[0069] (2) Weave the stainless steel wire into a mesh structure;

[0070] (3) The mesh structure is oxidized to form a porous metal mesh.

[0071] The preparation method of fiberglass composite panels includes the following steps:

[0072] (1) Prepare fiberglass cloth and resin substrate;

[0073] (2) Coating the surface of the fiberglass cloth with a resin substrate;

[0074] (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

[0075] The adhesive is a modified epoxy resin adhesive, and the preparation process of the modified epoxy resin adhesive is as follows:

[0076] Pre-dried magnesium lignin sulfonate and N,N-dimethylformamide were placed in a reactor at a mass ratio of 1:10. The mixture was then stirred at 90°C and 700 r / min for 3 hours. The temperature was then lowered to 55°C, and 0.2 times the mass of the pre-dried magnesium lignin sulfonate (triethylamine) was added to the reactor. Then, 0.1 times the volume of the N,N-dimethylformamide mixture was slowly added dropwise to the reactor over 30 minutes using a peristaltic pump, and the reaction continued for 2 hours. After the reaction, triethylamine and N,N-dimethylformamide were removed by vacuum distillation to obtain modified lignin. The temperature was then raised to 80°C, and 0.3 times the volume of N,N-dimethylformamide (cyclohexane) was added to the reactor. Epichlorohydrin was added dropwise over 30 minutes, followed by the addition of 0.2 times the volume of N,N-dimethylformamide in a 30% NaOH solution. The reaction was continued for 3 hours. After the reaction was completed, ice water with a volume of 2 times that of N,N-dimethylformamide was added to the reactor to terminate the reaction. Unreacted epichlorohydrin was removed by vacuum distillation, and N,N-dimethylformamide, NaOH, and NaCl generated during the reaction were removed by repeated centrifugation and washing. The resulting oily precipitate was the modified epoxy resin. The modified epoxy resin and E-51 type epoxy resin were then placed in a mixing tank at a mass ratio of 3:7. The mixture was then cured using T-31 type curing agent to obtain the modified epoxy resin adhesive.

[0077] The preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:10 and stirred at a speed of 800 r / min for 20 min to obtain the mixture.

[0078] Before bonding the metal mesh and fiberglass composite panel to the surface of the boron carbide ceramic substrate, apply a layer of adhesive to the surface of the boron carbide ceramic substrate. Then, when bonding each layer of material to its surface, apply another layer of adhesive.

[0079] The drying process is carried out at a temperature of 150℃ for 5 hours.

[0080] Example 3

[0081] A composite reinforced boron carbide bulletproof plate has a surface covered with a reinforcing material, the reinforcing material comprising a metal mesh and a fiberglass composite plate, the metal mesh being a porous mesh structure, and the fiberglass composite plate being a composite material made of fiberglass cloth and a resin substrate.

[0082] The metal mesh is made of stainless steel.

[0083] The thickness of the boron carbide ceramic matrix is ​​20 mm.

[0084] A method for preparing a composite reinforced boron carbide bulletproof plate includes the following steps:

[0085] (1) Prepare the boron carbide ceramic matrix;

[0086] (2) Preparation of metal mesh;

[0087] (3) Preparation of fiberglass composite panels;

[0088] (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure;

[0089] (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of materials.

[0090] The method for preparing a metal mesh includes the following steps:

[0091] (1) Prepare stainless steel wire;

[0092] (2) Weave the stainless steel wire into a mesh structure;

[0093] (3) The mesh structure is oxidized to form a porous metal mesh.

[0094] The preparation method of fiberglass composite panels includes the following steps:

[0095] (1) Prepare fiberglass cloth and resin substrate;

[0096] (2) Coating the surface of the fiberglass cloth with a resin substrate;

[0097] (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

[0098] The adhesive is a modified epoxy resin adhesive, and the preparation process of the modified epoxy resin adhesive is as follows:

[0099] Pre-dried magnesium lignin sulfonate and N,N-dimethylformamide were placed in a reactor at a mass ratio of 1:20. The mixture was then stirred at 80°C and 600 r / min for 3 hours. The temperature was then lowered to 50°C, and 0.1 times the mass of the pre-dried magnesium lignin sulfonate (triethylamine) was added to the reactor. Then, 0.1 times the volume of the N,N-dimethylformamide mixture was slowly added dropwise to the reactor over 30 minutes using a peristaltic pump, and the reaction continued for another 3 hours. After the reaction, the triethylamine and N,N-dimethylformamide were removed by vacuum distillation to obtain modified lignin. The temperature was then raised to 90°C, and 0.3 times the volume of N,N-dimethylformamide (cyclohexane) was added to the reactor. Epichlorohydrin was added dropwise to the reaction system over 30 minutes, followed by the addition of 0.2 times the volume of N,N-dimethylformamide in a 30% NaOH solution. The reaction was continued for 2 hours. After the reaction was completed, ice water with a volume equal to that of N,N-dimethylformamide was added to the reaction vessel to terminate the reaction. Unreacted epichlorohydrin was removed by vacuum distillation, and N,N-dimethylformamide, NaOH, and NaCl generated during the reaction were removed by repeated centrifugation and washing. The resulting oily precipitate was the modified epoxy resin. The modified epoxy resin and E-51 type epoxy resin were then placed in a mixing vessel at a mass ratio of 3:7. The mixture was then cured using T-31 type curing agent to obtain the modified epoxy resin adhesive.

[0100] The preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:20 and stirred at a speed of 700 r / min for 30 min to obtain the mixture.

[0101] Before bonding the metal mesh and fiberglass composite panel to the surface of the boron carbide ceramic substrate, apply a layer of adhesive to the surface of the boron carbide ceramic substrate. Then, when bonding each layer of material to its surface, apply another layer of adhesive.

[0102] The drying process is carried out at a temperature of 150℃ for 5 hours.

[0103] Comparative Example 1

[0104] A composite reinforced boron carbide bulletproof plate has a surface covered with a reinforcing material, the reinforcing material comprising a metal mesh and a fiberglass composite plate, the metal mesh being a porous mesh structure, and the fiberglass composite plate being a composite material made of fiberglass cloth and a resin substrate.

[0105] The metal mesh is made of stainless steel.

[0106] The thickness of the boron carbide ceramic matrix is ​​20 mm.

[0107] A method for preparing a composite reinforced boron carbide bulletproof plate includes the following steps:

[0108] (1) Prepare the boron carbide ceramic matrix;

[0109] (2) Preparation of metal mesh;

[0110] (3) Preparation of fiberglass composite panels;

[0111] (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure;

[0112] (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of materials.

[0113] The method for preparing a metal mesh includes the following steps:

[0114] (1) Prepare stainless steel wire;

[0115] (2) Weave the stainless steel wire into a mesh structure;

[0116] (3) The mesh structure is oxidized to form a porous metal mesh.

[0117] The preparation method of fiberglass composite panels includes the following steps:

[0118] (1) Prepare fiberglass cloth and resin substrate;

[0119] (2) Coating the surface of the fiberglass cloth with a resin substrate;

[0120] (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

[0121] The adhesive is E-51 type epoxy resin, which is cured using T-31 type curing agent.

[0122] The preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:20 and stirred at a speed of 700 r / min for 30 min to obtain the mixture.

[0123] Before bonding the metal mesh and fiberglass composite panel to the surface of the boron carbide ceramic substrate, apply a layer of adhesive to the surface of the boron carbide ceramic substrate. Then, when bonding each layer of material to its surface, apply another layer of adhesive.

[0124] The drying process is carried out at a temperature of 150℃ for 5 hours.

[0125] Testing methods: 1. Bending strength: measured using the three-point method; 2. Fracture toughness: measured using the single-sided notch method;

[0126] Table 1

[0127] Testing items Example 1 Example 2 Example 3 Comparative Example 1 Flexural strength / MPa 615 619 610 314 Fracture toughness / MPa·m1 / 2 4.5 4.6 4.9 1.2

[0128] By comparing Examples 1, 2, and 3 and Comparative Examples 1 and 2 in Table 1, this invention improves the compatibility of lignin sulfonate with organic reagents during the preparation of lignin adhesives by adding modified epoxy resin adhesives and modifying lignin sulfonate by incorporating hydrophobic long chains. The prepared lignin-based adhesive has good compatibility with epoxy resin adhesive components, and the modified lignin adhesive has better tensile elasticity and improved shear tensile strength of lignin sulfonate adhesives, thereby further increasing the bending strength and fracture toughness of the product. The combination of boron carbide ceramics and polymer-based composite materials gives the bulletproof plate high strength and high rigidity, which can effectively resist the impact and penetration of high-speed ballistics.

[0129] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0130] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A method for preparing a composite reinforced boron carbide bulletproof plate, characterized in that, Includes the following steps: (1) Prepare the boron carbide ceramic matrix; (2) Preparation of metal mesh; (3) Preparation of fiberglass composite panels; (4) The metal mesh and the fiberglass composite plate are respectively bonded to the surface of the boron carbide ceramic matrix to form a composite reinforced structure; (5) The composite reinforced boron carbide bulletproof plate is dried to fix the bonding between the layers of material; The surface of the boron carbide bulletproof plate is covered with a reinforcing material, which includes a metal mesh and a fiberglass composite plate. The metal mesh is a porous mesh structure, and the fiberglass composite plate is a composite material made of fiberglass cloth and resin substrate. The metal mesh is a stainless steel mesh; The thickness of the boron carbide ceramic matrix is ​​5-20 mm; The method for preparing the metal mesh includes the following steps: (1) Prepare stainless steel wire; (2) Weave the stainless steel wire into a mesh structure; (3) The mesh structure is oxidized to form a porous metal mesh; The adhesive is a modified epoxy resin adhesive, and the preparation process of the modified epoxy resin adhesive is as follows: Pre-dried magnesium lignin sulfonate and N,N-dimethylformamide were placed in a reaction vessel at a mass ratio of 1:10-1:

20. The mixture was then stirred at 80-100℃ and 600-800 r / min for 2-3 hours. The temperature was then lowered to 50-60℃, and 0.1-0.2 times the mass of the pre-dried magnesium lignin sulfonate was added to the reaction vessel with triethylamine. Then, 0.1-0.2 times the volume of the N,N-dimethylformamide mixture was slowly added dropwise to the reaction vessel over 30 minutes using a peristaltic pump, and the reaction continued for another 2-3 hours. After the reaction, the triethylamine and N,N-dimethylformamide were removed by vacuum distillation to obtain modified lignin. The temperature was then raised to 80-100℃, and N,N-dimethylformamide was added to the reaction vessel... Add 0.2-0.3 times the volume of epichlorohydrin to the reaction system, and then slowly add 0.1-0.2 times the volume of N,N-dimethylformamide to a 30% NaOH solution over 30 minutes. Continue the reaction for 2-3 hours. After the reaction is complete, add 1-2 times the volume of N,N-dimethylformamide to the reaction vessel to terminate the reaction. Remove unreacted epichlorohydrin by vacuum distillation, and remove N,N-dimethylformamide, NaOH, and NaCl generated during the reaction by repeated centrifugation and washing. The resulting oily precipitate is the modified epoxy resin. Then, place the modified epoxy resin and E-51 type epoxy resin in a mixing vessel at a mass ratio of 3:7, and then cure it using T-31 type curing agent to obtain the modified epoxy resin adhesive. The preparation process of the mixture is as follows: oleoyl chloride and N,N-dimethylformamide are placed in a stirred tank at a mass ratio of 1:10-1:20 and stirred at a speed of 600-800 r / min for 20-30 min to obtain the mixture; Before bonding the metal mesh and fiberglass composite panel to the surface of the boron carbide ceramic substrate, apply a layer of adhesive to the surface of the boron carbide ceramic substrate. Then, when bonding each layer of material to its surface, apply another layer of adhesive.

2. The method for preparing a composite reinforced boron carbide bulletproof plate according to claim 1, characterized in that, The preparation method of the fiberglass composite panel includes the following steps: (1) Prepare fiberglass cloth and resin substrate; (2) Coating the surface of the fiberglass cloth with a resin substrate; (3) Impregnate the resin substrate in the fiberglass cloth to form a fiberglass composite board.

3. The method for preparing the composite reinforced boron carbide bulletproof plate according to claim 1, characterized in that, The drying process is carried out at a temperature of 100-150℃ for 3-5 hours.